Demountable wheel.



T. DUFFY.

DEMGUNTABLE WHEEL. ?PLIGATION FILED JULY 1, 1910.

Patented @G 21, 1913.

l Unia" anrns rnrnnr ernten. f

THOMAS I. DUFFY, 0F GHICAGO, ILLINOIS, ASSIGNOE, TO HENRY EIQISWORTE AND ALBERT E. CROSS, BOTH OF CHICAGO, ILLINOIS, COPARTNEES DOING- BUSINESS UNDER THE FIRM-NAME 0F ELLSWORTH & CROSS. i

nnMoUN'rAnLE WHEEL.

amasar Application iiled July 1,1910. Serial No. 569,846.

Specification of Letters Patent.

To all 'whom t may concern Be it known that I, THOMAS I. DUFFY, a citizen of the United States, and a resident of Chicago, in the countyv of Cook and State of Illinois, have invented certain new and useful Improvements in y Wheels; and I do hereby declare that the following is a full, clear, and' exact description thereof, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in hubs for demountabl'e wheels, more especially adapted to automobile uses, of that kind shown in my prior application for United States Letters Patent, Serial Number 558,807, filed May 2nd, 1910. Said hub embraces separately formed tubular members or shells, the outer one of which carries the spokes, wheel' rim and pneumatic or other tire, and said outer member is adapted to be removably fitted over the inner memy ber which carries theantifrictien bearings of the wheel; the arrangement being such as to permit the principal part of the wheel which carries the tire to be readily removed and .replaced by another like part-wheelhaving thereon'a perfect tire so asv to quickly substitute a perfect tire for a defective tire.

'Ihe part-wheel, which carries f the tire, is adapted to be carried in any suitable manner on the car in the manner of a spare wheel, @to be lsubstituted te replace a defective tire when occasion requires. A convenient carrying device for the part-wheel Aconsists of a short stud ixed yto any suitable part of the cai'. of a size to extend through and closely fit in the outer hub member and provided at its'end with a nut to hold the part-wheel thereon.

Among the objects of the invention is to provide an economical and simple form of construction of a wheel hub .of-this character, and the invention consists in the matters hereinafter set forth and more particularly pointed ont in the appended claims.,

In the drawings, Iigure 1 is an axial seetion of a demountable hub embodying my invention. Fig. 2 is a cross section on line 2-2 of Fig. v1. Fig. 3 is a rear elevation of the inner memberof the hub. Itig. 1- is a section similar to Fig. 2, showing a modiication.

Demountable The hub comprises as its principal elements an inner shell or member 10 which is interiorly fashioned to receive the anti-'friction bearings of the hub, (not shown) and an-outer shell or member 11 which is fitted over the inner member and is arranged to carry the spokes, rim and tire of the wheel (not shown). The outer member is provided with an integral flange 12, between which and a slip flange 13, itted over the outer member, is formed an annular groove 14 to receive the tenons of the wheel spokes. Said flanges are apertured to receive the bolts by which to clamp the spokes to the hub. The rear end of the inner member is formed with an exterior taper 1,5, said inner member being made largest at its rear end. The inner member iselongated beyond the outer member to provide a space to receive the end of the axle and the anti-frictionl bearings and is eXteriorly screw-threaded at closes the outer end of the hub. The outer member 11 is provided with an` interior taper 17, complemental to and adapted to interlit with the exterior taper 15 of the inner member. The outer end of the inner member is made of such diameter as to permit the outer member to be passed thereover to fitthe taperedv outer member over the tapered inner member. The saidmembers are forced together to wedge the complemental tapered surfaces thereof tightly upon each other by means of the screw bolts 18, 18 which extend through openings in the said outer member at the base of the flange 12 and engage alined screw-threadedl openings in the rear thickened portion of the inner member. The said bolts 18 are inclined to the axis of the hub so as to pass diagonally through the interfitting inner ant outer shells or members ofthe hub. In order to` provide stock in` which the bolt holes of the outer member may be formed, the said outer member may be thickened at the points 19, 19.v In the manufacture of the hub the bolt openings for the bolts 18 are drilled after the tapered members have been fitted together and brought to their final seating positions one on the other. In this manner accurate registration of the bolt openings of the two parts is assured. By engagement of the screw threads of the bolts with the screw threads of the bolt holes of the inner niember, and of the heads of said bolts with the outer face of the fiange 12, the said outer member is pressed upon the inner member to wedge the tapered surfaces of said members Ainto close interitting engagement. The said bolts 18 constitute, not only means for wedging the tapered surfaces of the members together, but also afford interlocking means to lock the outer member from rotation on the inner member. The said inner and outer "members may be additionally interlooked against relative rotation by makingl the tapered portions of the members slightly oval in cross sectiomasset forth in my aforesaid prior applicatiomor by otherwise varying the cross section of said tapered portions from a true circle. The dotted circles a., t on Figs. 2 and 3 of the drawing indicate the divergence of the cross Section of the'tapered portions from a true circle. lnsom'e' cases the said tapered portions of'theinner and outerhub members may be made circular in cross section, as shown 1n Fig. il, and the bolts 18,with or without other keying means,

maybe relied upon to edect the interlocking of the hub members against rotation. Int'he use of a wheel provided with my improved demountable hub, when it is desired to substitute a part-wheel with a perfeet pneumatictire for a part-wheel havingthereon an injured or worn tire, the locking bolts 18 are first removed and the outer member 11 of the hub and the parts of the wheel carried thereby are thereafter forced outwardly over the inner member. When the outer member of the hub and the part# wheel carried thereby are thus removed, theV vtapered outer member of a du licate part Wheel is tted to the inner mem er, the bolt openings of the members brought to regis-A ter and-the bolts 18 inserted inplace and l screwed inwardly to clamp the members together. v

The hub described may be made at comparatively small expense and provides means for readily replacing a blown out or punctured tire with a perfect tire.

, It is obvious that the details of the hub shown are capable of slight variations within the scope and spirit of my invention, and

the invention is not limited to' the exact structural details illustrated, except as hereinafter made the'subject of specific claims.

l claim as my invention v l. In a demountable wheel, a hub comprising an inner member formed-to 'receive .an axle and bearings, and providedV with an exterior. taper, an outer lor socket member fitted thereover and removable endwise therefrom in demounting the wheel, and provided with front and rear spoke flanges and with an interior tapered surface to engage throughout its length the Vexterior taper of the inner member, anda plurality of screw-*threaded bolts havin headed ends located radially exterior to t e inner periphery of the said outenmember, andextending through openings insaid outer member and engaging screw-threaded openings in y the inner member, said bolts being arranged obliquely to the axes'of the hub members and crossing at a long angle the meeting taperedfaces of the inner and outer members, whereby the resisting areas of said bolts against shearing stress is increased beyond the normal diameters of said bolts.

2. In a demountable wheel, a hub comprising an inner member formed to receive an axle and bearings, and provided with anexterior taperan outer or socket member fitted thereover and removable endwise therefrom in demounting the wheel, and provided with front and rear spoke langes and with an interior tapered surface to engage throughout its length the-exterior taper of the inner member, and a plurality,l of screw-threaded bolts having headed ends. located radially exterior to the inner periphery of the said outer member, and extending through openings `in said outer` member and engaging screw-threaded openings in the inner mem.

In testimony, that I clalm the foregoing as my invention l affix my signature in thev presence of two witnesses, this 28th day of June A. D. 19,710. j

l ri-ionas i. DUFFY;

Witnesses:

W; L.' HALL, WILIJAM GoLDnERGER. 

